Fire extinguisher



May 5, 1931. E. PAQUETTE FIRE EXTINGUISHER Filed Sept. lO, 1927 ATTORN EY Patented May 5, 1931 EUGENE! PAQUETTE, OF WILLIMANSETT, Tv'IASSAGZUSETTS FXR-E EXTNGUISHER Application filed September 10, 1927. Serial No. 218,667.

The present invention relates to a lire extinguisher of the type in which the piston employed is adapted to be driven forward under the reaction of a released compressed spi-ino' to eject an incombustible fluid to extinguish lire.

ln carrying out my invention, l provide a cylindrical casing open at one end and an airtight integral rear wall at the other end in which l mount, adapted to reciprocate, a close fitting piston mounted on a central sectional rod surrounded by a helical spring of an hour-glass shape, that is to say, of smaller diameter at the center than at the ends, and form in the rod when the piston is at its extreme outer position a groove to admit a pivoted latch mounted in said rear wall. The forward end of the cylinder is provided with a screw cap having a screw threaded central nozzle closed by a cooperating screw cap. l provide also eccentrically on the cap a screw plug to aord a filling opening for an incombustible fluid by which the cylinder may be filled; the spring may then be put under compression and latched and stored for emergency use.

My invention therefore consistsof a lire extinguisher having a semi-capped nozzle at the outer end, a piston and operating rod connected thereto, a casing and hour glass shaped compressible spring and a pivoted latch on the rear wall of the cylinder adapted to be shifted into engagement to lock the piston when the spring is under strain by engagement with a cooperating groove in the piston rod.

In the accompanying drawings, illustrating my invention,

Y Figure l is a median vertical section of a fire extinguisher embodying my improvement.

Figure 2 is a partial sectional View showing a latched position of the piston.

Figure 3 is a sectional view in plane on 3-3 of Figure 2.

Referring now in detail to the drawings, l represents a long metallic cylinder preferably formed of metal tubing suoli as brass which does not readily oXidize, the rear wall of which is either integral or secured by a solder of brazing so as to be absolutely liquid tight. Cooperating with the cylinder' is a piston 2 preferably in the form of a leather cup with overhanging cylindrical walls to engage and snugly enclose a washer 6 which in conjunction with a plate member 6 carried upon the opposite side of the washer expands it by means of a nut 7 so as to put pressure on the leather cup and make it oil and air tight. The plate member 6 is furthermore provided with a depending sleeve portion 62 projecting centrally of and through the leather cup and terminating in juxtaposition to the adjacent surface of the vwasher 6 to provide a clearance adjustment therebetween. The upper surface of the plate member 6 is in additionutilized for the purpose of providing a seat for the adjacent end convolution of a spring to be rmentioned in the following. The piston is reciprocated by a piston rod 9 which is preferably sectional as indicated in Figure l by means of a screw threaded joint 10 and is provided with an arched handle of a conventional shape to grasp in setting the piston. The piston rod is provided with a groove at a point to bring it flush with the rear wall of the cylinder when an hourglassshaped compression spring lOgis fully compressed, as indicated at 10', in Figures l and 2, and a sharp nosed latch'll pivoted in a plane to be pressed laterally on the face of the cylinder to lock the spring as indicated in Figure 2 when the handle is fully drawn out to put the spring under compression. The outer end of the cylinder is providedv with a tight tting screw threaded cap l2 having a central perforated nozzle 13 through which an incombustible liquid may be expelled from the cylinder. A cap 14 liquid tight seal for the extinguisher when filled with a fire extinguishing fluid. The extinguishing liquid may be of any suitable character which 0n reaching the seat of fire will disengage an incombustible lire extinguishing gas under Athe heat of the flame. Various uids of this character are available on the market but in emergency water saturated with a soluble carbonate will yield engaging a thread on the nozzle forms a good results since being volatilized by the flame; if the latter is not already quenched by the steam formed, the carbonate will be decomposed evolving a considerable body of carbonic acid which will keep the air from access and will thus quench the fire. In operating the device, the caps lil and l5 are removed, the piston is drawn back to put the spring under tension and the latch ll left under the edge of the recess l0. The quenching fluid is introduced at tl e plug l5 and it and the cap 14 are screwed tight so as to produce a liquid tight seal. In this potential position, the device may be stored on a hook for an emergency and will be in condition for instant application by unscrewing the cap 14 and releasing the latch l1.

As evidenced from the illustration of my invention in Figures l and 2 of the drawing, the lowermost extremity of the sectional shaft 9 is reduced as at ll for projection through the sleeve and to define a shoulder portion ll2 against which the upper side of the plate member 6 reposes to restrict independent longitudinal shifting movement of same and preserve disposition of the same at right angles to the cylinder.

I am aware that spring operated tire eX- tinguishers are not broadly new, but the sectional piston and latch mechanism and the particular form of helical spring employed are cooperating novel features which render my extinguisher exceedingly effective. The sectional piston rod facilitates assembly with a long spring and the shape of the spring prevents it from buckling laterally to any great degree, thereby permitting right line rebound and maximum thrust.

In addition, the sectional rod permits of storing the i'ire extinguisher in restricted places, which is an important feature of the invention. After the piston has been set by Yengaging the latch ll within the groove of the inner or piston carried section of the rod, the outer or handle section may be removed. This especially adapts the invention for use in automobiles, small boats, and in other places where economy of space is necessary. After the extinguisher has been used, the handle section of the rod may be engaged with the inner section to reset the piston. l

Having thus described the invention, I claim:

In a fire extinguisher, a cylindrical container, a normally closed discharge port at one end thereof, a normally closed filling opening for thecontainer adjacent said end of the container, a piston operating within the container, a sectional rod having one end secured to the piston and its opposite end extending through the other end of the container yand comprising an inner piston carried section and an outer detachable sec EUGENE PAQUETTE. 

